i have same problem, but i have the sony HC3 hi def.
Im sure its iee related, i have a asus, with on board Fire Wire.
I have ordered a PCI fire wire card, and it will arrive in the next day, so i then see if its the On board Firewire from motherboard is to blame.
The windows XP drivers for the on board Firewire are very old, and have not found any updated ones.
So this is why im trying the PCI Capture card route.
Live from Norwich !
Sony PC1000E ( Stopped working after 13months)
Sony HDR-HC3 4Mega Pixels High Def Mini DV Broke
Canon HF 10 - Broke
Waiting for the Sony HDR-GW55VE
Avid Studio, + Pinnacle Studio14, Win7 64bit 12 GIG memory, Nvidia GTX590, twin 3D display, 2Terrabyte HD